Phase-coherence transition in granular superconductors with $π$ junctions

Details Phase-coherence transition in granular superconductors with $π$ junctions Phase-coherence transition in granular superconductors with $π$ junctions

2000-12-13

arxiv.org/abs/cond-mat/0012238v1

J. Magn. Magn. Matter. 226, 364 (2001)

Physics

Condensed Matter

Superconductivity

5 pages, 1 figure, Proc. of ICM 2000, to appear in J. Magn. Magn. Mater

Scientific paper

10.1016/S0304-8853(00)01064-7

We study the three-dimensional XY-spin glass as a model for the resistive behavior of granular superconductors containing a random distribution of $\pi$ junctions, as in high-$T_c$ superconducting materials with d-wave symmetry. The $\pi$ junctions leads to quenched in circulating currents (chiralities) and to a chiral-glass state at low temperatures, even in the absence of an external magnetic field. Dynamical simulations in the phase representation are used to determine the nonlinear current-voltage characteristics as a function of temperature. Based on dynamic scaling analysis, we find a phase-coherence transition at finite temperature below which the linear resistivity should vanish and determine the corresponding critical exponents. The results suggest that the phase and chiralities may order simultaneously for decreasing temperatures into a superconducting chiral-glass state.

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